21000891275

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{557}}^1\times {\mathrm{16573}}^1$

素因数の和:17160

約数の個数: 48

約数和(自身を含む): 32110069824

約数和(自身を除く): 11109178549

約数列:

[1, 5, 7, 13, 25, 35, 65, 91, 175, 325, 455, 557, 2275, 2785, 3899, 7241, 13925, 16573, 19495, 36205, 50687, 82865, 97475, 116011, 181025, 215449, 253435, 414325, 580055, 1077245, 1267175, 1508143, 2900275, 5386225, 7540715, 9231161, 37703575, 46155805, 64618127, 120005093, 230779025, 323090635, 600025465, 840035651, 1615453175, 3000127325, 4200178255, 21000891275]

約数ペア:

[(1, 21000891275), (5, 4200178255), (7, 3000127325), (13, 1615453175), (25, 840035651), (35, 600025465), (65, 323090635), (91, 230779025), (175, 120005093), (325, 64618127), (455, 46155805), (557, 37703575), (2275, 9231161), (2785, 7540715), (3899, 5386225), (7241, 2900275), (13925, 1508143), (16573, 1267175), (19495, 1077245), (36205, 580055), (50687, 414325), (82865, 253435), (97475, 215449), (116011, 181025)]